Blacked and isorted the python files

Prettied and eslinted the typescript/html files

bookie/src/app/sales/discount/discount-datasource.ts

@@ -1,16 +1,14 @@
 import { DataSource } from '@angular/cdk/collections';
 import { Observable, of as observableOf } from 'rxjs';
 
-export class DiscountDataSource extends DataSource<{name: string, discount: number}> {
-
-  constructor(private data: {name: string, discount: number}[]) {
+export class DiscountDataSource extends DataSource<{ name: string; discount: number }> {
+  constructor(private data: { name: string; discount: number }[]) {
     super();
   }
 
-  connect(): Observable<{name: string, discount: number}[]> {
+  connect(): Observable<{ name: string; discount: number }[]> {
     return observableOf(this.data);
   }
 
-  disconnect() {
-  }
+  disconnect() {}
 }